Name

TAU (6.28318...)
Examples 
x = width/2
y = height/2
d = width * 0.8
arc(x, y, d, d, 0, QUARTER_PI)
arc(x, y, d-20, d-20, 0, HALF_PI)
arc(x, y, d-40, d-40, 0, PI)
arc(x, y, d-60, d-60, 0, TAU)
Description TAU is an alias for TWO_PI, a mathematical constant with the value 6.28318530717958647693. It is twice the ratio of the circumference of a circle to its diameter. It is useful in combination with the trigonometric functions sin() and cos().
Related PI (3.14159...)
TWO_PI (6.28318...)
HALF_PI (1.57079...)
QUARTER_PI (0.78539...)

Updated on Mon Sep 21 15:53:25 2020.

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